Effects of Chitosan / Nanoclay Bentonite on the Mechanical Properties, Water Permeability and Microstructure of Nanocomposite Film

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HASHEMI J.; Neves M.; NAKAJIMA M.

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Journal: ELECTRONIC JOURNAL OF FOOD PROCESSING AND PRESERVATION Year:2018 | Volume:10 | Issue:1 Page(s): 33-46

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Title

Effects of Chitosan / Nanoclay Bentonite on the Mechanical Properties, Water Permeability and Microstructure of Nanocomposite Film

Author(s)

HASHEMI J. | Neves M. | NAKAJIMA M. | Issue Writer Certificate

Keywords

ChitosanQ2

Water vapor permeabilityQ2

Nanoclay bentoniteQ1

NanocompositeQ2

Scanning electron microscopyQ2

Abstract

Background and objectives: Chitosan-based Biopolymer films have been widely studied to be used as a substitute for plastic polymers. Because of their hydrophilic nature, such polysaccharide films show poor mechanical properties in the moist condition that limits its application. Incorporating nano-materials into the basic biopolymer, known as nano-composite films, is one of the promising methods to improve physico-mechanical properties and water permeability of biopolymer-based films. In this research, the effect of different ratios of bentonite nanoclay/Chitosan on the Water vapor permeability (WVP), mechanical properties, and surface microstructure of the Chitosan Nanocomposite films was evaluated. Materials and methods: At first, different aqueous solutions of Chitosan biopolymer (2 and 3% w/v) and bentonite nanoclay (1 and 3% of Chitosan weight) were prepared, separately. The Chitosan solution was then slowly added to the clay suspension at 55 oC. The Nanocomposite films were prepared using the solvent-casting method. Control samples with 2 and 3% Chitosan were also prepared. WVP, tensile strength (TS), elongation at break (E), and microstructures of the final films were investigated. Results: The results showed that bentonite nanoclay had a significant effect (p<0. 01) on WVP and TS of Chitosan Nanocomposite films. By adding 1% Nanoclay bentonite to the polymer matrix, TS increased to 0. 66 MPa (2% Chitosan) and 0. 35 MPa (3% Chitosan). Moreover, the elongation value decreased to 8. 8% and 6. 47% in the Nanocomposite films with 2 and 3% Chitosan, respectively. When clay content increased to 3 wt % in Chitosan (2 wt%) Nanocomposites film, WVP, elongation and TS decreased. According to the SEM micrograph, non-homogeneous structure was found for 1% clay-Chitosan Nanocomposite in comparison to the control sample. By increasing the concentration of Nanoclay bentonite to 3%, the pore size of resulting film increased which was followed by a decrease in TS. Conclusion: According to the findings of this research, it can be concluded that addition of bentonite nanoclay would improve mechanical, morphological, and WVP properties of Chitosan-based film.

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APA: Copy

HASHEMI, J., Neves, M., & NAKAJIMA, M.. (2018). Effects of Chitosan / Nanoclay Bentonite on the Mechanical Properties, Water Permeability and Microstructure of Nanocomposite Film. ELECTRONIC JOURNAL OF FOOD PROCESSING AND PRESERVATION, 10(1 ), 33-46. SID. https://sid.ir/paper/380579/en

Vancouver: Copy

HASHEMI J., Neves M., NAKAJIMA M.. Effects of Chitosan / Nanoclay Bentonite on the Mechanical Properties, Water Permeability and Microstructure of Nanocomposite Film. ELECTRONIC JOURNAL OF FOOD PROCESSING AND PRESERVATION[Internet]. 2018;10(1 ):33-46. Available from: https://sid.ir/paper/380579/en

IEEE: Copy

J. HASHEMI, M. Neves, and M. NAKAJIMA, “Effects of Chitosan / Nanoclay Bentonite on the Mechanical Properties, Water Permeability and Microstructure of Nanocomposite Film,” ELECTRONIC JOURNAL OF FOOD PROCESSING AND PRESERVATION, vol. 10, no. 1 , pp. 33–46, 2018, [Online]. Available: https://sid.ir/paper/380579/en

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